Mississippi Administrative Code
Title 11 - Mississippi Department of Environmental Quality
Part 5 - Underground Storage Tank Regulations
Chapter 2 - Mississippi Commission on Environmental Quality Underground Storage Tanks Regulations Technical Standards and Corrective Action Requirements for Owners and Operators of Underground Storage Tanks (UST) (Adopted March 22, 1989; Amended August 25, 2011, Last Amended August 23, 2018)
Appendix 11-5-2-280.4 - GUIDELINES FOR THE PERMANENT CLOSURE OF PETROLEUM UNDERGROUND STORAGE TANK SYSTEMS
Section 11-5-2-280.4-8 - AMPLE ANALYSIS
Section 11-5-2-280.4-8.1 - Tanks

The samples must be analyzed for the product last stored in the UST (refer to the table below). However, if evidence of a leak from a previously stored product is found or it is known that the tank stored a different substance at one time, the samples must be analyzed for that substance also. For example, all of the tanks have stored gasoline for the past several years but it is known that one of the tanks was once used to store diesel fuel. Therefore, all samples collected from the tank excavation would have to be analyzed for both PAH and BTEX.

In addition, if an excavation contained tanks that stored substances that require both BTEX and PAH analysis (i.e. gasoline and diesel fuel), all samples collected from the excavation must be analyzed for both BTEX and PAH.